[ Objective ] The dynamic change of heterobacteria and vibrios in larvae industrialized culture system was studied to provide scientific reference for healthy cultivation of shrimp. [ Method ] The heterobacteria, vibr...[ Objective ] The dynamic change of heterobacteria and vibrios in larvae industrialized culture system was studied to provide scientific reference for healthy cultivation of shrimp. [ Method ] The heterobacteria, vibrios and pathogenic vibrio parahaemolyticus were monitored in larvae industrialized culture system. [ Result] The heterobacteria, vibrios and pathogenic vibrio parahaemolyticus were the most in fertilized eggs of shrimp but the least in nauplius, then their number would increase with growth. During whole rearing period, both boterobacteria in larvae, vibrios in water would increase by one order of magnitude, while both vibrios in larvae and heterobacteria in water would increase by two orders of magnitude. There were many heterobacteria and vibrios but few vibrio parahaemolyticus in living bait. The correlation coefficients between larvae and heterobacteria and vibrios in water were 0. 704 and 0. 840 in culture system respectively, while the correlation among heterobacteria, vibrios in living bait and larvae, water were weak or negative. [ Conclusion ] There was a dynamic relation between water and larvae in rearing period, and restrictly control of culture condition would restrain the occurrence of disease caused by vibrio parahaemolyticus, besides that bacteria number in bait was not obviously correlated with bacteria nubmer in culture system.展开更多
The summer occurrence and distribution of vibrios in the fishes and shellfishes in the coasal waters of Hong Kong were investigaed. A total of 69 strains of vibrios were isolated from all samples examined. The strains...The summer occurrence and distribution of vibrios in the fishes and shellfishes in the coasal waters of Hong Kong were investigaed. A total of 69 strains of vibrios were isolated from all samples examined. The strains, along with 10 reference strains were classified with the technique of numerical taxonomy bared on 54 characters and 62 of the 69 strains fell into 5 major phena, identified as V. paraheamolyticus (30 strains), V. alginoloticus (23 strains), V. choloerae (3 strains), V. harveyi (2 strains) and V. fluinalis (4 strains). Among them, V.paraheamolyticus and V. alginolyticus were the predominant species in the fishes, shellfishes and the coastal waters of Hong Kong and comprised 43. 5 % and 33. 3 % of the total Vibrio spp. isolates respectively. Meanwhile, 3 strains of non-Ol V. cholerae were isolated from oyster and it was the first time to record V. cholerae non-Ol in seawater or from shellfishes in Hong Kong. These results highlighted the potential risks of food poisoning associated with raw or undercooked seafood.展开更多
Bacteria of the genus Vibrio are ubiquitously distributed in the marine environment. Due to the rapid expansion of intensive mariculture and the consequent deterioration of culture conditions, more and more Vibrio spp...Bacteria of the genus Vibrio are ubiquitously distributed in the marine environment. Due to the rapid expansion of intensive mariculture and the consequent deterioration of culture conditions, more and more Vibrio spp. have been recognized as pathogenic agents in outbreaks of vibriosis, a serious epizootic disease affecting most wild and farmed fish species worldwide, which has become the most important limiting factor for the development of intensive mariculture industry. Attempts have been made to understand the pathogenicity of vibrios in host fish with the ultimate aim of elucidating the best means for disease control. After an extensive literature survey of the recent advances in the field of fish vibriosis, the pathological changes, virulence factors and associated potential pathogenic mechanisms, transmission routes and related environmental factors involved in outbreak of vibriosis, as well as the controlling strategies are reviewed in the present paper.展开更多
The distribution featires, spotes composition and seasonal variation of halophilic Vibrios in 7 stations ofXiamen Harbor and 9 stations of the Daya Bay were studied. The counts of Vibrios were analyzed with the most p...The distribution featires, spotes composition and seasonal variation of halophilic Vibrios in 7 stations ofXiamen Harbor and 9 stations of the Daya Bay were studied. The counts of Vibrios were analyzed with the most probable number(MPN) technique. The media TCBS was used to isolate Vibrios, and API20E system employed to identifythe Vibrios. The results reveals that the density Of Vibrios in the Daya Bay ranged from 30. 0 x 105 to 2. 4 x 105 celldin-3 and the average density was 6. 61 x 103 cell·din-3, and that in Xiamen Harbor was 2. 3 x 102-2. 4 x 105 cen·din-3 and 7. 8 x 103 cell·din-3 on the average. The number of Vibrios varied seasonally with the water temperature,and was heher in the summer than in the autumn. The Vibrio species in the two bays mainly included Vibrioalginolyticus, V. parahaemolytic-us, V. fluvialis, V. vulnificus, V. mimices and V. metshnikovii and V.alginolyticus was the predominant spotes.展开更多
Bacterin was prepared by formalin-inactivating the virulent strain of Vibrio hollisae isolated from diseased Seriola dumerili （amberjack） suffering from vibriosis. Healthy S. dumeriIi were vaccinated by respective p...Bacterin was prepared by formalin-inactivating the virulent strain of Vibrio hollisae isolated from diseased Seriola dumerili （amberjack） suffering from vibriosis. Healthy S. dumeriIi were vaccinated by respective procedures of intramuscular injection, immersion, and orally administration. Results of the three different vaccinations were compared. Blood was drawn from the vaccinated fish every 7 days, and the antibody titers and lysozyme activities of the sera were determined. The antibody titer of injected fish was 1：40 at 7 d, and reached its peak of 1：320 at 28 d, while the fish vaccinated by immersion and orally administration exhibited weak antibody responses, the antibody titres of 〈1：10, 1：20, 1：160 were observed at 7 d, 14 d, 35 d respectively. Compared with the control, the vaccinated fish exhibited significantly higher lysozyme activities （P〈0.05）. Upon challenge with virulent strain, the relative percent survival （RPS） of injected, immersed and oral administrated fish were 75%, 45%, and 40% respectively, and the injected fish showed significantly higher RPS than immersed and oral administrated fish. The results suggested that vaccination of S. dumerili by the injection would be the best strategy to prevent the vibriosis in S. dumerili farm.展开更多
Vibrio harveyi cells(dose>103 cells mL-1)and extracellular products(ECP;>25μg mL-1 of total protein concentration)destroyed haematopoietic cultures of Nephrops norvegicus within 24 h of exposure.Cytopathic effe...Vibrio harveyi cells(dose>103 cells mL-1)and extracellular products(ECP;>25μg mL-1 of total protein concentration)destroyed haematopoietic cultures of Nephrops norvegicus within 24 h of exposure.Cytopathic effects(CPE)started after 4 h of exposure to the bacterial cells,with some granularity in the cytoplasm,mostly in cells in the outer periphe-ry of the explant growth.At the end of the infection,a considerable number of nuclei remained attached to the substrate,apparently unaffected.Following exposure to ECP,initial deterioration was observed at 2 h with the presence of granularity in the cytoplasm of<20%cells,and few cells displayed small vacuoles around the nuclei.Parallel results were obtained using whole animal experiments,with V.harveyi cells being lethal to nephrops within 24 h.展开更多
Objective:To analyse experimental infection and immune system of shrimp(Penaeus monodon)against Vibrios furnissii(V.furnissii).Methods:Experimental animals were collected and acclimatized by maintaining specific tempe...Objective:To analyse experimental infection and immune system of shrimp(Penaeus monodon)against Vibrios furnissii(V.furnissii).Methods:Experimental animals were collected and acclimatized by maintaining specific temperature,pH and salinity to avoid mortality.Shrimps were experimentally infected with V.furnissii and their immune responses were monitored.After the infection all the shrimps were monitored for any symptoms,death rate in 0,12,24,36,48 h.Then haemolymph were collected and tetrahydrocannabinol,phenol oxidase,nitroblue tetrazolium and lysozyme were monitored in every 12 h at the interval of 48 h.Results:Shrimps infected by live V.furnissii had showed gradual increase in tetrahydrocannabinol,phenol oxidase activity,nitro-blue-tetrazolium and lysozyme activity comparing with the killed and control.Conclusions:The live V.furnissii had showed infection in the shrimp immune system.The live V.furnissii shows infection in experimental shrimps comparing with killed V.furnissii.So the V.furnissii in nature cause the infection in shrimp Penaeus monodon immune system.This report could be applied to control of the infection in shrimp hatchery.展开更多
Non-O1/non-O139 Vibrio(V.)cholerae(NOVC)has emerged as a potential pathogen in patients with compromised health conditions[1].We report the whole genome sequencing(WGS)of a rare NOVC sepsis isolate(GenBank Accession:G...Non-O1/non-O139 Vibrio(V.)cholerae(NOVC)has emerged as a potential pathogen in patients with compromised health conditions[1].We report the whole genome sequencing(WGS)of a rare NOVC sepsis isolate(GenBank Accession:GCF_051906115.1)from an 89-year-old male admitted to the Intensive Care Unit(ICU)with septic shock(lactate 6.61 mmol/L)digestive illness.展开更多
Objective:To study the ecology of antibiotic resistant bacteria with emphasis on sucrose negative vibrios in water and sediments samples of traditional shrimp farming system(bhery)in West Bengal,India.Methods:The vibr...Objective:To study the ecology of antibiotic resistant bacteria with emphasis on sucrose negative vibrios in water and sediments samples of traditional shrimp farming system(bhery)in West Bengal,India.Methods:The vibrios were isolated from traditional shrimp farm samples on thiosulphate citrate bile salt sucrose agar and sucrose negative bacterial strains were used as biomarkers to assess the frequency of antibiotic resistance.Results:The incoming water brought presumptive vibrios ranging from 5.50×10^(1)to 1.00×10^(3)mL in to the bhery,and there appeared to build up vibrios in the culture system with days of culture,as there was about 9 fold increase in vibrios.The levels of vibrios were observed to be moderately higher in outlet water and ranged between 4.15×10^(2)and 4.15x10^(3)mL.The counts of vibrios in pond sediment was found to be 1.00x10^(2)-4.90×10^(3)g;while in inlet(2.00×10^(2)-4.20×10^(4)g)and outlet(3.00×10^(2)-6.85×10^(3)g)their levels were observed to be higher than the pond sediment.Thirteen different Vibrio species were encountered in traditional shrimp culture system and all vibrios were sensitive to chloramphenicol,followed by ciprofloxacin and gatifloxacin(98.24%),gentamicin(95.61%)and other antibiotics.The multiple antibiotic resistance(MAR),i.e.,resistance to at least two antibiotics,was noticed among 43.85%of the sucrose negative vibrios and 41.86%of the sucrose negative non--vibrios.All vibrios harveyi strains exhibited MAR.Although no antibiotic was used in the bhery,the prevalence of MAR in 44%of the sucrose negative vibrios and nonvibrios is a cause of concern.The MAR index was higher in inlet water and sediment samples.The MAR observed in biomarker strains of pond water and sediment(40%)was comparable to those of inlet samples,thus confirming the fact that incoming water was the major source of antibiotic resistant bacteria.Conclusions:It seems that the shrimp culture in bhery does not favour the proliferation and spread of antibiotic resistant bacteria.展开更多
Non-O1/non-O139 Vibrio cholerae(NOVC)has multiple pathogenic pathways in humans.The cause of disease in influenced by the virulence genes carried by the infecting strain and the health condition of the host.[1-2]When ...Non-O1/non-O139 Vibrio cholerae(NOVC)has multiple pathogenic pathways in humans.The cause of disease in influenced by the virulence genes carried by the infecting strain and the health condition of the host.[1-2]When seafood,food and water sources are contaminated with feces,people are prone to gastroenteritis,and direct exposure to contaminated water may cause wound infection.展开更多
Recently,more and more bacteria have been reported to become tolerant to antibiotics.In this study,one tnaA gene involved in indole production,and the effect of exogenous indole on the formation of persister cells spe...Recently,more and more bacteria have been reported to become tolerant to antibiotics.In this study,one tnaA gene involved in indole production,and the effect of exogenous indole on the formation of persister cells specific to tetracycline in Vibrio splendidus were characterized.The tnaA Vs gene was first cloned and conditionally expressed in Escherichia coli Rosetta(DE3).To investigate the regulatory effect of TnaA Vs,the tnaA deletion strain AJ01/ΔtnaA was constructed by in-frame deletion.The undetected extracellular indole in the AJ01/ΔtnaA indicated that TnaA was the solo enzyme to produce indole in V.splendidus.The drop plate method showed that AJ01/ΔtnaA was more tolerant to the higher concentration of tetracycline than that of AJ01,being 340-fold higher in the proportion of survived cells when cell density OD 600≈0.65.Moreover,the synergistic effects of indole and tetracycline on killing of V.splendidus were determined.Results show that addition of 2-mmol/L indole increased the susceptibility of both AJ01 and AJ01/ΔtnaA to 10×minimum inhibitory concentration tetracycline.To explore the genes and pathways regulated by TnaA Vs,the transcriptomic analysis between AJ01 and AJ01/ΔtnaA was performed.Result shows that TCA cycle,arginine biosynthesis,quorum sensing and microbial metabolism in diverse environments were downregulated,while the ribosome pathways,the protein metabolic process,peptide biosynthetic and metabolic process were upregulated in the AJ01/ΔtnaA.This study shows that indole could enhance the bactericidal effect of tetracycline on V.splendidus by decreased ribosome level probably but increased ATP level.展开更多
The Chinese seabass(Lateolabrax maculatus)is one of the most popular and valuable aquaculture species in China.Recently,the disease caused by Vibrio anguillarum has brought huge economic losses in the L.maculatus indu...The Chinese seabass(Lateolabrax maculatus)is one of the most popular and valuable aquaculture species in China.Recently,the disease caused by Vibrio anguillarum has brought huge economic losses in the L.maculatus industry.However,the immune response of L.maculatus after V.anguillarum infection remains unknown.In this study,the blood homeostasis,gut microbiota and transcriptomic profiling of L.maculatus after V.anguillarum infection were investigated.Our results indicated that the levels of superoxide dismutase(SOD),alanine aminotransferase(ALT)and total bilirubin(TBIL)increased,while the levels of blood glucose(BG),total protein(TP)and albumin(ALB)decreased after V.anguillarum infection.The analysis of the gut microbiota composition revealed that the dominant phyla was Firmicutes and Proteobacteria,and the relative abundance of genus Vibrio increased after V.anguillarum infection.Subsequently,the differentially expressed genes(DEGs)in the kidney and spleen after V.anguillarum infection were analyzed by transcriptome sequencing.The results indicated that immunity-related genes like TLR5,TLR8,TLR9,IL-1β,CCL3,IFNγ,CXCL11 and TNFαwere affected and the NOD-like receptor signaling pathway,cytokine-cytokine receptor interaction and Toll-like receptor signaling were activated.Thus,an effective immune and pro-flammatory response can help resist V.anguillarum infection.Our results provide a theoretical support for improving the disease resistance ability of L.maculatus.展开更多
[Objectives]This study was conducted to investigate the functional characteristics of the trxB gene in Vibrio alginolyticus.[Methods]A pair of specific primers was designed based on the trxB gene sequence of V.alginol...[Objectives]This study was conducted to investigate the functional characteristics of the trxB gene in Vibrio alginolyticus.[Methods]A pair of specific primers was designed based on the trxB gene sequence of V.alginolyticus for PCR cloning of its full-length sequence.Systematic bioinformatics analyses were conducted to predict the physicochemical properties,secondary structure,and tertiary structure of the encoded protein.[Results]The trxB gene is 960 bp in length,encoding 319 amino acid residues.The deduced protein has a predicted molecular weight of 34.32 kDa and an isoelectric point(pI)of 4.77.Analysis of the amino acid sequence revealed a distinct signal peptide cleavage site at the N-terminus,with no transmembrane domains.The functional sites are as follows:1 N-glycosylation site,1 cAMP-and cGMP-dependent protein kinase phosphorylation site,4 protein kinase C phosphorylation sites,7 casein kinase II phosphorylation sites,1 tyrosine kinase phosphorylation site,11 N-myristoylation sites,1 prenyl group binding site,3 microbody C-terminal targeting signal sites,and 1 xanthine nucleotide-disulfide oxidoreductase class II active site.Subcellular localization prediction indicated the highest probability(44.4%)for endoplasmic reticulum localization.The TrxB amino acid sequence of V.alginolyticus shares 97.2%-98.4%homology with other Vibrio species,and they were clustered within the same subgroup.Secondary structure prediction showed proportions of random coils(31.97%),alpha-helices(31.66%),extended strands(25.08%),and beta turns(11.29%).The tertiary structure model exhibited 88.68%similarity to template 5vt3.1.A.[Conclusions]This study elucidated the characterization of the TrxB protein in V.alginolyticus,laying a theoretical foundation for the development of outer membrane protein subunit vaccines against this pathogen.展开更多
[Objectives]To develop a pair of specific primers for the PCR amplification of the full-length relA gene from Vibrio alginolyticus strain HY9901,as well as to conduct bioinformatics analysis.[Methods]The relA gene was...[Objectives]To develop a pair of specific primers for the PCR amplification of the full-length relA gene from Vibrio alginolyticus strain HY9901,as well as to conduct bioinformatics analysis.[Methods]The relA gene was amplified through PCR,and the resulting gene sequence was subsequently analyzed using bioinformatics tools,including amino acid sequence prediction,functional site analysis,subcellular localization prediction,and homology comparison.[Results]The relA gene had a total length of 2220 bp and encoded 739 amino acid residues.The molecular weight was approximately 84.1261 kDa,and its isoelectric point was 5.95.The protein lacked a signal peptide and transmembrane regions,while exhibiting multiple phosphorylation sites.Predictions regarding its subcellular localization suggested that it was predominantly situated in the cytoplasm.The amino acid sequence demonstrated a homology of 97%to 99%with other species within the genus Vibrio,and it clustered within the same subfamily as V.antiquarius and V.diabolicus.In the prediction of secondary structure,the proportions ofα-helix,extended strand,random coil,andβ-sheet were 54.13%,12.04%,28.15%and 5.68%,respectively.The similarity between the tertiary structure model and template 5kpw.1.w was 66%.[Conclusions]In this study,the relA gene of V.alginolyticus strain HY9901 has been successfully amplified and analyzed.The structural characteristics and potential functions of the encoded protein have been elucidated,thereby providing foundational data for understanding the role of this gene in V.alginolyticus.展开更多
[Objectives] To analyze the function of cobQ gene from Vibrio alginolyticus strain HY9901,and to provide a reference for exploring the possible mechanism of cobQ gene from V.alginolyticus.[Methods] A pair of primers w...[Objectives] To analyze the function of cobQ gene from Vibrio alginolyticus strain HY9901,and to provide a reference for exploring the possible mechanism of cobQ gene from V.alginolyticus.[Methods] A pair of primers were designed based on the sequence of the V.alginolyticus cobQ gene and used to amplify the full-length gene by PCR.[Results] The PCR amplification results indicated that the cobQ gene has a full length of 780 bp,encoding 259 amino acid residues.The deduced amino acid sequence predicts a molecular weight of approximately 28.83 kD and an isoelectric point of 9.21.Sequence analysis revealed no N-terminal signal peptide cleavage site,suggesting the absence of both a signal peptide and transmembrane regions in this protein.The amino acid sequence contains 2 N-terminal myristoylation sites,1 N-glycosylation site,1 glycosaminoglycan attachment site,4 microbody C-terminal targeting signal sites,3 casein kinase II phosphorylation sites,and 4 protein kinase C phosphorylation sites.Subcellular localization prediction showed that the CobQ protein is primarily localized in the cytoplasm(65.2%probability).Homology analysis demonstrated that the amino acid sequence of the cobQ gene from V.alginolyticus shares up to 99%homology with other Vibrio species,clustering within the same subclade as Vibrio parahaemolyticus,indicating close phylogenetic relationships.Secondary structure prediction revealed proportions ofα-helices,random coils,and extended strands as 44.40%,36.68%,and 18.92%,respectively.The tertiary structure model exhibited 87.62%similarity to the template A0A165XBE1.1.[Conclusions] In this study,the V.alginolyticus cobq gene was successfully cloned and its sequence was analyzed by bioinformatics.It is expected to lay a foundation for the subsequent study of the regulatory mechanism of its protein on the virulence of V.alginolyticus.展开更多
基金the National High Technology Research and Development Program of China (863 Program) (2006AA10A406)National Key Technology Research and Development Program of China (2006BAD01A13)Public Agriculture Specific Research Program (nyhyzx07-042)~~
文摘[ Objective ] The dynamic change of heterobacteria and vibrios in larvae industrialized culture system was studied to provide scientific reference for healthy cultivation of shrimp. [ Method ] The heterobacteria, vibrios and pathogenic vibrio parahaemolyticus were monitored in larvae industrialized culture system. [ Result] The heterobacteria, vibrios and pathogenic vibrio parahaemolyticus were the most in fertilized eggs of shrimp but the least in nauplius, then their number would increase with growth. During whole rearing period, both boterobacteria in larvae, vibrios in water would increase by one order of magnitude, while both vibrios in larvae and heterobacteria in water would increase by two orders of magnitude. There were many heterobacteria and vibrios but few vibrio parahaemolyticus in living bait. The correlation coefficients between larvae and heterobacteria and vibrios in water were 0. 704 and 0. 840 in culture system respectively, while the correlation among heterobacteria, vibrios in living bait and larvae, water were weak or negative. [ Conclusion ] There was a dynamic relation between water and larvae in rearing period, and restrictly control of culture condition would restrain the occurrence of disease caused by vibrio parahaemolyticus, besides that bacteria number in bait was not obviously correlated with bacteria nubmer in culture system.
文摘The summer occurrence and distribution of vibrios in the fishes and shellfishes in the coasal waters of Hong Kong were investigaed. A total of 69 strains of vibrios were isolated from all samples examined. The strains, along with 10 reference strains were classified with the technique of numerical taxonomy bared on 54 characters and 62 of the 69 strains fell into 5 major phena, identified as V. paraheamolyticus (30 strains), V. alginoloticus (23 strains), V. choloerae (3 strains), V. harveyi (2 strains) and V. fluinalis (4 strains). Among them, V.paraheamolyticus and V. alginolyticus were the predominant species in the fishes, shellfishes and the coastal waters of Hong Kong and comprised 43. 5 % and 33. 3 % of the total Vibrio spp. isolates respectively. Meanwhile, 3 strains of non-Ol V. cholerae were isolated from oyster and it was the first time to record V. cholerae non-Ol in seawater or from shellfishes in Hong Kong. These results highlighted the potential risks of food poisoning associated with raw or undercooked seafood.
文摘Bacteria of the genus Vibrio are ubiquitously distributed in the marine environment. Due to the rapid expansion of intensive mariculture and the consequent deterioration of culture conditions, more and more Vibrio spp. have been recognized as pathogenic agents in outbreaks of vibriosis, a serious epizootic disease affecting most wild and farmed fish species worldwide, which has become the most important limiting factor for the development of intensive mariculture industry. Attempts have been made to understand the pathogenicity of vibrios in host fish with the ultimate aim of elucidating the best means for disease control. After an extensive literature survey of the recent advances in the field of fish vibriosis, the pathological changes, virulence factors and associated potential pathogenic mechanisms, transmission routes and related environmental factors involved in outbreak of vibriosis, as well as the controlling strategies are reviewed in the present paper.
文摘The distribution featires, spotes composition and seasonal variation of halophilic Vibrios in 7 stations ofXiamen Harbor and 9 stations of the Daya Bay were studied. The counts of Vibrios were analyzed with the most probable number(MPN) technique. The media TCBS was used to isolate Vibrios, and API20E system employed to identifythe Vibrios. The results reveals that the density Of Vibrios in the Daya Bay ranged from 30. 0 x 105 to 2. 4 x 105 celldin-3 and the average density was 6. 61 x 103 cell·din-3, and that in Xiamen Harbor was 2. 3 x 102-2. 4 x 105 cen·din-3 and 7. 8 x 103 cell·din-3 on the average. The number of Vibrios varied seasonally with the water temperature,and was heher in the summer than in the autumn. The Vibrio species in the two bays mainly included Vibrioalginolyticus, V. parahaemolytic-us, V. fluvialis, V. vulnificus, V. mimices and V. metshnikovii and V.alginolyticus was the predominant spotes.
基金Supported by NSFC (No. B9910030)Key Technologies Program of Fujian Province (No. 2000z080)
文摘Bacterin was prepared by formalin-inactivating the virulent strain of Vibrio hollisae isolated from diseased Seriola dumerili （amberjack） suffering from vibriosis. Healthy S. dumeriIi were vaccinated by respective procedures of intramuscular injection, immersion, and orally administration. Results of the three different vaccinations were compared. Blood was drawn from the vaccinated fish every 7 days, and the antibody titers and lysozyme activities of the sera were determined. The antibody titer of injected fish was 1：40 at 7 d, and reached its peak of 1：320 at 28 d, while the fish vaccinated by immersion and orally administration exhibited weak antibody responses, the antibody titres of 〈1：10, 1：20, 1：160 were observed at 7 d, 14 d, 35 d respectively. Compared with the control, the vaccinated fish exhibited significantly higher lysozyme activities （P〈0.05）. Upon challenge with virulent strain, the relative percent survival （RPS） of injected, immersed and oral administrated fish were 75%, 45%, and 40% respectively, and the injected fish showed significantly higher RPS than immersed and oral administrated fish. The results suggested that vaccination of S. dumerili by the injection would be the best strategy to prevent the vibriosis in S. dumerili farm.
基金The support of European Union grant(FAIR-CI97-3413)is gratefully acknowledged.
文摘Vibrio harveyi cells(dose>103 cells mL-1)and extracellular products(ECP;>25μg mL-1 of total protein concentration)destroyed haematopoietic cultures of Nephrops norvegicus within 24 h of exposure.Cytopathic effects(CPE)started after 4 h of exposure to the bacterial cells,with some granularity in the cytoplasm,mostly in cells in the outer periphe-ry of the explant growth.At the end of the infection,a considerable number of nuclei remained attached to the substrate,apparently unaffected.Following exposure to ECP,initial deterioration was observed at 2 h with the presence of granularity in the cytoplasm of<20%cells,and few cells displayed small vacuoles around the nuclei.Parallel results were obtained using whole animal experiments,with V.harveyi cells being lethal to nephrops within 24 h.
基金Supported by University Grant Commission(UGC),New Delhi,India.
文摘Objective:To analyse experimental infection and immune system of shrimp(Penaeus monodon)against Vibrios furnissii(V.furnissii).Methods:Experimental animals were collected and acclimatized by maintaining specific temperature,pH and salinity to avoid mortality.Shrimps were experimentally infected with V.furnissii and their immune responses were monitored.After the infection all the shrimps were monitored for any symptoms,death rate in 0,12,24,36,48 h.Then haemolymph were collected and tetrahydrocannabinol,phenol oxidase,nitroblue tetrazolium and lysozyme were monitored in every 12 h at the interval of 48 h.Results:Shrimps infected by live V.furnissii had showed gradual increase in tetrahydrocannabinol,phenol oxidase activity,nitro-blue-tetrazolium and lysozyme activity comparing with the killed and control.Conclusions:The live V.furnissii had showed infection in the shrimp immune system.The live V.furnissii shows infection in experimental shrimps comparing with killed V.furnissii.So the V.furnissii in nature cause the infection in shrimp Penaeus monodon immune system.This report could be applied to control of the infection in shrimp hatchery.
文摘Non-O1/non-O139 Vibrio(V.)cholerae(NOVC)has emerged as a potential pathogen in patients with compromised health conditions[1].We report the whole genome sequencing(WGS)of a rare NOVC sepsis isolate(GenBank Accession:GCF_051906115.1)from an 89-year-old male admitted to the Intensive Care Unit(ICU)with septic shock(lactate 6.61 mmol/L)digestive illness.
基金supported by Department of Aquatic Animal Health,Faculty of Fishery Sciences,West Bengal University of Animal and Fishery Sciences,West Bengal,India.(FFS/Adm-21/323)
文摘Objective:To study the ecology of antibiotic resistant bacteria with emphasis on sucrose negative vibrios in water and sediments samples of traditional shrimp farming system(bhery)in West Bengal,India.Methods:The vibrios were isolated from traditional shrimp farm samples on thiosulphate citrate bile salt sucrose agar and sucrose negative bacterial strains were used as biomarkers to assess the frequency of antibiotic resistance.Results:The incoming water brought presumptive vibrios ranging from 5.50×10^(1)to 1.00×10^(3)mL in to the bhery,and there appeared to build up vibrios in the culture system with days of culture,as there was about 9 fold increase in vibrios.The levels of vibrios were observed to be moderately higher in outlet water and ranged between 4.15×10^(2)and 4.15x10^(3)mL.The counts of vibrios in pond sediment was found to be 1.00x10^(2)-4.90×10^(3)g;while in inlet(2.00×10^(2)-4.20×10^(4)g)and outlet(3.00×10^(2)-6.85×10^(3)g)their levels were observed to be higher than the pond sediment.Thirteen different Vibrio species were encountered in traditional shrimp culture system and all vibrios were sensitive to chloramphenicol,followed by ciprofloxacin and gatifloxacin(98.24%),gentamicin(95.61%)and other antibiotics.The multiple antibiotic resistance(MAR),i.e.,resistance to at least two antibiotics,was noticed among 43.85%of the sucrose negative vibrios and 41.86%of the sucrose negative non--vibrios.All vibrios harveyi strains exhibited MAR.Although no antibiotic was used in the bhery,the prevalence of MAR in 44%of the sucrose negative vibrios and nonvibrios is a cause of concern.The MAR index was higher in inlet water and sediment samples.The MAR observed in biomarker strains of pond water and sediment(40%)was comparable to those of inlet samples,thus confirming the fact that incoming water was the major source of antibiotic resistant bacteria.Conclusions:It seems that the shrimp culture in bhery does not favour the proliferation and spread of antibiotic resistant bacteria.
基金supported by the National Natural Science Foundation(82372206)the Jiangsu Provincial Health Commission(H2023107)the project of basic and clinical research on cardiac arrest in the Emergency and Critical Care Department of the Second Affiliated Hospital of Soochow University(XKTJ-XK202408-2).
文摘Non-O1/non-O139 Vibrio cholerae(NOVC)has multiple pathogenic pathways in humans.The cause of disease in influenced by the virulence genes carried by the infecting strain and the health condition of the host.[1-2]When seafood,food and water sources are contaminated with feces,people are prone to gastroenteritis,and direct exposure to contaminated water may cause wound infection.
基金Supported by the Zhejiang Provincial Natural Science Foundation for Distinguished Young Scholar(No.LR20C190001)the National Natural Science Foundation of China(No.42376103)+1 种基金the Natural Science Foundation of Ningbo City(No.2021J062)the K.C.Wong Magna Fund in Ningbo University。
文摘Recently,more and more bacteria have been reported to become tolerant to antibiotics.In this study,one tnaA gene involved in indole production,and the effect of exogenous indole on the formation of persister cells specific to tetracycline in Vibrio splendidus were characterized.The tnaA Vs gene was first cloned and conditionally expressed in Escherichia coli Rosetta(DE3).To investigate the regulatory effect of TnaA Vs,the tnaA deletion strain AJ01/ΔtnaA was constructed by in-frame deletion.The undetected extracellular indole in the AJ01/ΔtnaA indicated that TnaA was the solo enzyme to produce indole in V.splendidus.The drop plate method showed that AJ01/ΔtnaA was more tolerant to the higher concentration of tetracycline than that of AJ01,being 340-fold higher in the proportion of survived cells when cell density OD 600≈0.65.Moreover,the synergistic effects of indole and tetracycline on killing of V.splendidus were determined.Results show that addition of 2-mmol/L indole increased the susceptibility of both AJ01 and AJ01/ΔtnaA to 10×minimum inhibitory concentration tetracycline.To explore the genes and pathways regulated by TnaA Vs,the transcriptomic analysis between AJ01 and AJ01/ΔtnaA was performed.Result shows that TCA cycle,arginine biosynthesis,quorum sensing and microbial metabolism in diverse environments were downregulated,while the ribosome pathways,the protein metabolic process,peptide biosynthetic and metabolic process were upregulated in the AJ01/ΔtnaA.This study shows that indole could enhance the bactericidal effect of tetracycline on V.splendidus by decreased ribosome level probably but increased ATP level.
基金received funding from the Natural Science Foundation of Shandong Province(No.ZR2023MC141)the Innovation and Entrepreneurship Training Program for College Students(No.202210435003)financial support was also provided by the‘First Class Fishery Discipline’Program and the Special Talent Program‘One Thing One Decision(Yishi Yiyi)’in Shandong Province,China。
文摘The Chinese seabass(Lateolabrax maculatus)is one of the most popular and valuable aquaculture species in China.Recently,the disease caused by Vibrio anguillarum has brought huge economic losses in the L.maculatus industry.However,the immune response of L.maculatus after V.anguillarum infection remains unknown.In this study,the blood homeostasis,gut microbiota and transcriptomic profiling of L.maculatus after V.anguillarum infection were investigated.Our results indicated that the levels of superoxide dismutase(SOD),alanine aminotransferase(ALT)and total bilirubin(TBIL)increased,while the levels of blood glucose(BG),total protein(TP)and albumin(ALB)decreased after V.anguillarum infection.The analysis of the gut microbiota composition revealed that the dominant phyla was Firmicutes and Proteobacteria,and the relative abundance of genus Vibrio increased after V.anguillarum infection.Subsequently,the differentially expressed genes(DEGs)in the kidney and spleen after V.anguillarum infection were analyzed by transcriptome sequencing.The results indicated that immunity-related genes like TLR5,TLR8,TLR9,IL-1β,CCL3,IFNγ,CXCL11 and TNFαwere affected and the NOD-like receptor signaling pathway,cytokine-cytokine receptor interaction and Toll-like receptor signaling were activated.Thus,an effective immune and pro-flammatory response can help resist V.anguillarum infection.Our results provide a theoretical support for improving the disease resistance ability of L.maculatus.
基金Supported by Natural Science Foundation of Guangdong Province(2025A1515011061)Outstanding Graduate Entering Laboratory Project of College of Fisheries,Guangdong Ocean University+1 种基金Undergraduate Innovation and Entrepreneurship Training Program of Guangdong Ocean University(CXXL2024007)Undergraduate Innovation Team of Guangdong Ocean University(CCTD201802).
文摘[Objectives]This study was conducted to investigate the functional characteristics of the trxB gene in Vibrio alginolyticus.[Methods]A pair of specific primers was designed based on the trxB gene sequence of V.alginolyticus for PCR cloning of its full-length sequence.Systematic bioinformatics analyses were conducted to predict the physicochemical properties,secondary structure,and tertiary structure of the encoded protein.[Results]The trxB gene is 960 bp in length,encoding 319 amino acid residues.The deduced protein has a predicted molecular weight of 34.32 kDa and an isoelectric point(pI)of 4.77.Analysis of the amino acid sequence revealed a distinct signal peptide cleavage site at the N-terminus,with no transmembrane domains.The functional sites are as follows:1 N-glycosylation site,1 cAMP-and cGMP-dependent protein kinase phosphorylation site,4 protein kinase C phosphorylation sites,7 casein kinase II phosphorylation sites,1 tyrosine kinase phosphorylation site,11 N-myristoylation sites,1 prenyl group binding site,3 microbody C-terminal targeting signal sites,and 1 xanthine nucleotide-disulfide oxidoreductase class II active site.Subcellular localization prediction indicated the highest probability(44.4%)for endoplasmic reticulum localization.The TrxB amino acid sequence of V.alginolyticus shares 97.2%-98.4%homology with other Vibrio species,and they were clustered within the same subgroup.Secondary structure prediction showed proportions of random coils(31.97%),alpha-helices(31.66%),extended strands(25.08%),and beta turns(11.29%).The tertiary structure model exhibited 88.68%similarity to template 5vt3.1.A.[Conclusions]This study elucidated the characterization of the TrxB protein in V.alginolyticus,laying a theoretical foundation for the development of outer membrane protein subunit vaccines against this pathogen.
基金Supported by Natural Science Foundation of Guangdong Province(2025A1515011061)Outstanding Graduate Entering Laboratory Project of College of Fisheries,Guangdong Ocean University+1 种基金Undergraduate Innovation and Entrepreneurship Training Program of Guangdong Ocean University(CXXL2024007)Undergraduate Innovation Team of Guangdong Ocean University(CCTD201802).
文摘[Objectives]To develop a pair of specific primers for the PCR amplification of the full-length relA gene from Vibrio alginolyticus strain HY9901,as well as to conduct bioinformatics analysis.[Methods]The relA gene was amplified through PCR,and the resulting gene sequence was subsequently analyzed using bioinformatics tools,including amino acid sequence prediction,functional site analysis,subcellular localization prediction,and homology comparison.[Results]The relA gene had a total length of 2220 bp and encoded 739 amino acid residues.The molecular weight was approximately 84.1261 kDa,and its isoelectric point was 5.95.The protein lacked a signal peptide and transmembrane regions,while exhibiting multiple phosphorylation sites.Predictions regarding its subcellular localization suggested that it was predominantly situated in the cytoplasm.The amino acid sequence demonstrated a homology of 97%to 99%with other species within the genus Vibrio,and it clustered within the same subfamily as V.antiquarius and V.diabolicus.In the prediction of secondary structure,the proportions ofα-helix,extended strand,random coil,andβ-sheet were 54.13%,12.04%,28.15%and 5.68%,respectively.The similarity between the tertiary structure model and template 5kpw.1.w was 66%.[Conclusions]In this study,the relA gene of V.alginolyticus strain HY9901 has been successfully amplified and analyzed.The structural characteristics and potential functions of the encoded protein have been elucidated,thereby providing foundational data for understanding the role of this gene in V.alginolyticus.
基金Natural Science Foundation of Guangdong Province(2025A1515011061)Outstanding Graduate Entering Laboratory Project of College of Fisheries,Guangdong Ocean University+1 种基金Undergraduate Innovation and Entrepreneurship Training Program of Guangdong Ocean University(CXXL2024007)Undergraduate Innovation Team of Guangdong Ocean University(CCTD201802).
文摘[Objectives] To analyze the function of cobQ gene from Vibrio alginolyticus strain HY9901,and to provide a reference for exploring the possible mechanism of cobQ gene from V.alginolyticus.[Methods] A pair of primers were designed based on the sequence of the V.alginolyticus cobQ gene and used to amplify the full-length gene by PCR.[Results] The PCR amplification results indicated that the cobQ gene has a full length of 780 bp,encoding 259 amino acid residues.The deduced amino acid sequence predicts a molecular weight of approximately 28.83 kD and an isoelectric point of 9.21.Sequence analysis revealed no N-terminal signal peptide cleavage site,suggesting the absence of both a signal peptide and transmembrane regions in this protein.The amino acid sequence contains 2 N-terminal myristoylation sites,1 N-glycosylation site,1 glycosaminoglycan attachment site,4 microbody C-terminal targeting signal sites,3 casein kinase II phosphorylation sites,and 4 protein kinase C phosphorylation sites.Subcellular localization prediction showed that the CobQ protein is primarily localized in the cytoplasm(65.2%probability).Homology analysis demonstrated that the amino acid sequence of the cobQ gene from V.alginolyticus shares up to 99%homology with other Vibrio species,clustering within the same subclade as Vibrio parahaemolyticus,indicating close phylogenetic relationships.Secondary structure prediction revealed proportions ofα-helices,random coils,and extended strands as 44.40%,36.68%,and 18.92%,respectively.The tertiary structure model exhibited 87.62%similarity to the template A0A165XBE1.1.[Conclusions] In this study,the V.alginolyticus cobq gene was successfully cloned and its sequence was analyzed by bioinformatics.It is expected to lay a foundation for the subsequent study of the regulatory mechanism of its protein on the virulence of V.alginolyticus.
